2026/07/31 by Zhouyue Fan, Yuzhi Che, Xinchou Lou +6
Physics and Astronomy · #hep-ex
arxiv created 2026/08/03 · arxiv updated 2026/08/04
The production rates of Ξ-/Ξ+ baryons in energy-ranked jets produced in Z\tohadrons decays are measured using 3.2 million hadronic Z events recorded by the DELPHI experiment. Jets are reconstructed using the Durham algorithm with ycut=0.005. Quark- and gluon-enriched jet samples are obtained by ranking the jet energies in three-jet events. The softest jet are found to produce fewer Ξ-/Ξ+ and less energetic baryons than the other jets. The ratio of Ξ-/Ξ+ production rates in gluon and quark jets, each normalized to the corresponding mean charged-particle multiplicity, is measured to be 1.21 ± 0.18~(stat.) ± 0.26~(syst.). The result is consistent with the JETSET expectation and the OPAL measurements of KS0 and Λ productions in Z decays. This study presents the first measurement of the gluon-to-quark production ratio for baryons containing two s quarks, providing new insights into strange-quark production and hadronization. Future e+e- colliders such as CEPC and FCCee will provide much larger Z-boson samples and will allow far more precise studies of the subject.